> > BTW, use LDI e OTI are usually better, when working on video, than
> >OTIR and LDIR... But remember: OTIR is the same speed as LDIR *inside*
> >de Z80. And on MSX, every OUT, specially for VDP, receives some Waits...
> >and so, on MSX OTIR to VDP is slower than LDIR to VDP.
>
> I made a mistake as Ricardo has advised me. LDIR is really the same speed
> than OTIR (only TR add waits here), but if you use OTIR to VDP at the same
> speed as LDIR to ADVRAM, on TR Z80 and normal MSXs, in some cases you can
> hang your computer (yes!!! there is really the need for waits on this
> OUT, and no one set them up!) Ricardo has done a program to test speed
> that locks the Z80 MSXs... (-;
Whow, that's news (not).
You need to add 7 T-states of wait (usually an LD A,n) between two OUTs.
However, OTIR itself is that slow the wait is already included.
> BTW, using OTIR on R800 mode is, usually, slower than on Z80 mode (!!!!)
True. The turboR engine waits too long (I believe it waits 8 T-states,
according to the VDP's official specs, while 7 or even 6 T-states is long
enough).
~Grauw
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